The structures of daljanelins A-C 1 , 3 and 5, the first pterocarpan-neoflavonoid oligomers, and of daljanelin D 6 a related isoflavonoid-neoflavonoid analogue from Dulbergiu nitidula were established by spectroscopic methods. The structure and stereochemistry of daljanelin C 5 were unambiguously confirmed by synthesis via introduction of an electrophilic C-1 fragment to a pterocarpan nucleus followed by anionic coupling of a C,C, precursor and the late introduction of the final C6 fragment by a Grignard reaction.Paper 4/06549B

Oligomeric Isoflavonoids. Part 3. Daljanelins A-D, the First Pterocarpan-and Isoflavonoid-Neoflavonoid Analogues. -The title daljanelins are isolated from Dalbergia nitidula. The structure and stereochemistry of daljanelin C (VIII) are unambiguously confirmed by an independent synthesis starting from the pterocarpan derivative (I). -(FERREIRA, J. A.; NEL, J. W.; BRANDT, E. V.; BEZUIDENHOUDT, B. C. B.; FERREIRA, D.; J. Chem. Soc., Perkin Trans. I (1995) 8, 1049-1056; Dep. Chem., Univ. Orange Free State, Bloemfontein 9300, S. Afr.; EN)